Electric motor



Aug. 3 1926. 1,594,597

S. A. BROWN ET AL ELECTRIC MOTOR Filed Oct. 17. 1925 Fig.1.

. J e/rdor: STEF EN A.BRO WN, EDQHRWBROGKME YER,

Patented Aug. 3, 1926.

UNITED STATES PATENT or FlCE.

STEITEN A. BROWN AND EDGAR W. BROCKMEYER, OF DAYTON, OHIO.

ELECTRIC MOTOR.

Application filed October 17, 1925. Serial No. 62,948.

a of forcing the brushes into engagement with p the commutator so that not only will the pressure be equalized but that the heat generated due to current carried by the brushes and the contact of the brushes with the commutator will not be communicated to the springs and destroy the temper of thesprings.

It is a further object to provide means of easily locking the brushes in their retracted position; each brush being independently retracted and locked with respect to the other brushes.

It is a further object to so arrange the brushes that they may be permittedto wear down to the connection of the shunt wire to the brush so as to secure the maximum of wear out of the brush.

It is a furtherob'ect to provide a construction in which a long brush may be utilized.

Referring to the drawings:

Fig. 1 is a lan view of the brush holder and brushes s IOWlIl two of the brushes in a normal position 0 contact with the fragmentary portion of the commutator illustrated, a third brush fully extended showin the extent to which the brush may be force inwardly and therefore used up, and showing the fourth brush' in locked position with its housin in section; 1

Fig. 2 is a si e elevation in section of the brush housing showing the method of supporting an individual brush in relation to the commutator; v

Fig. 3 is-an end elevation of one of the brushes showing the oove.

Referring to these rawings in detail, 1 is a supporting brush ring either made of a casting or of a stamping and of such-material as inay be desired. This rin carries a plurality of terminals such as 2 w ich carry the shunt wires 3,'such wires, having their free ends embedded in the inner end, as at 4,

of the'brush 5. The brush is provided at its outer end with a transverse groove 6 in which rides the rounded head 7 of an impeller arm 8. This impeller arm is pivoted midway between adjacent brushes on the brush ring as at 9. Two of such arms are pivoted on'a single pivot 9'. Ap roximately one-third of the distance from t e free ends of the arms on the inner sides thereof are eyes 10 to which are connected springs 11,

edge necessarily an appreciable distance from the commutator surface. The brush holder consists of a plate 13 and a U-shaped guide member 14 with slots 15 in its side walls and flaring flanges 16 used for attach ing this U-shaped member by the bolts 17 or screws to the plate 13 and the supporting ring.

It will vbe observed that this arrangement of engaging the brushes with the arms permits the radiation of the heatand thereby prevents the drawing of the temper of the spring 11.

When it isdesired to hold the brush out of ofieration the brush can be pulled outwar shunt wire and pulling it into the position shown at the bottom of Figure 1, allowing the head 7 of the arm 8 to side preventing it from returning. The pressure of the spring 11 drawing the arm inwardly forces the brush against the side wall of the brush guide preventing its movement.

It is understood that we desire to comprehend within our invention such modifications as may be necessary to adapt the invention to varyin conditions of use.

Having thus fu ly described our invention, what-we claim as new and desire to secure by Letters Patent, is:

1. In a brush holder, a supporting means, brush guides mountedthereon, brushes therein, impeller arms pivoted on said supporting means having their free ends engaging with rest against the the ends of the brushes, and a yielding means for drawing said impeller arms to one another and thereby forcing the brushes inwardly.

2. In a brush-holder, a supporting means, brush guides mounted thereon, brushes therein, impeller arms pivoted on saidsupporting means having their free ends engaging with the ends of the brushes, and a yielding means for drawing said impeller arms to one another and thereby forcing the brushes inwardly, said impeller arms being pivoted on a common pivot.

3. In a brush holder, a supporting means, brush guides mounted thereon, brushes therein, impeller arms pivoted on said supportin means having their free ends engaging wit 'the ends of the brushes, and a yielding means for drawing said impeller arms to one another and thereby forcing the brushes inwardly, said impeller arms being pivoted on a common pivot, said brush guides having slots in theirsides to accommodate the ends of the arms as they move inwardly.

4. In a brush holder, a supporting means, brush guides mounted thereon, brushes therein, impeller arms pivoted on said supporting means having their free ends engaging with the ends of the brushes, and a yielding means for drawing said im eller arms to one another and thereby forcing the brushes inwardly, said impeller'arms being pivoted on a common pivot, said brushes having news in the ends thereof for accommoating the ends of the impeller arms.

5. In a brush holder a supporting ring, a plurality of inwardly pro ecting brush holders, brushes therein adapted to reciprocate therein, said holders having means for accommodating the ends of slrunt wires and brush impellers, pairs of brush impellers located between pairs of brushes ivoted on said supporting means and yielding means connected inwardly between said impellers to the impellers at points remote from their extreme ends, said extreme ends engaging with said brushes.

6. In a brush holder, a supporting rin a plurality of inwardly projecting brus holders, brushes therein adapted to reciprocate therein, said holders having means for accommodating the ends of shunt wires and brush impellers, pairs of brush impellers located between pairs of brushes pivoted on said supporting means, and yielding means connecte inwardly between said impellers to the impellers at points remote from their extreme ends, said extreme ends en aging with said brushes, said. brushes having grooves on the outer ends thereof for accommodating the ends of said impellers.

a I. In a brush holder, a ring, a plurality brushes, said guides being adapted to permit the ends of the arms to pass therethrough, and ielding means between said arms to draw t em together and to force the brushes inwardly, said arms being appropriatel arranged "at an angle of ninety degrees rom one another, said angle decreasmg as the brushes are worn.

8. In a brush holder, a supporting means, guide means for brushes, brushes reci rocating therein, impelling means, yiel ing means to actuate the impelling means, which impelling means engages with the brushes, said means being so arranged that when the brushes are retracted 'a predetermined distance the impelling means will engage with the sides of the brushes and so bind them in the ide of the brush that the brush will be hel in a predetermined position out of engagement with its commutator.

9. In a brush holder, a supporting means, guide means for brushes, brushes reci rocating therein, impellin means, yiel ing means to actuate the impe ling means, which inipelling means engages with the brushes, said means being so arranged that when the brushes are retracted a predetermined distance the impelling means will enga with the sides of the brushes and so bind t em in the guide of the .brush that the brush will be held in a predetermined position out of engagement with its commutator, said impelling means consisting of arms pivoted on the supporting means with the yielding means connected to and between said arms for the respective brushes, the yielding means being adapted to move the arm inwardly against the side of the brush when the arm and brush are in looking position to hold the brush so locked.

10. In a brush su port, a ring havin spaced terminals for s unt wires and space supports for brush guides, brush guides, brushes therein adapted to reci rocate, grooves in the outer ends of said impeller arms pivoted on said ring between said guides and a yielding means between said arms spaced from the free ends thereof, the free ends of the arms bein adapted to ride in the grooved end of the% guides having slots on the sides thereof for accommodating the shunt wires and ends of the impeller arms.

In testimony whereof, we aflix our signatures'. 1 a

STEFFEN. A. 'BROWN.

rushes,

Ill

rushes, said EDGAR: w. BROCKMEYER. 

